ShareGoo 5 Pack High Sensitivity Soil Moisture Sensor,Automatic Arduino Sensor Module Watering System Manager for Arduino TE215 This is a must have tool for a connected garden! It will be helpful to remind you to water your indoor plants or to monitor the soil moisture in your garden. Can be used in module plant waterer device, and the plants in your garden no need people to manage Operating voltage: 3.3V-5V Module Output is high level when the soil moisture deficit,or output is low Module dual output mode, digital output, analog output more accurate.